Omron CPM1 - PROGRAMING MANUAL 02-2001 Programming Manual page 170

CompoBus/S I/O Master Functions (SRM1(-V2) and CPM2C-S Only)
Status Flags
Uppermost bits: Slave Communications Error Flags
Word
15 14 13
AR04 OUT OUT OUT
7 6 5
AR05 IN7 IN6 IN5
AR06 OUT OUT OUT
15 14 13
AR07 IN15 IN14 IN13
SRM1 (-V2)
or CPM2C-S
CompoBus/S
communications path
3. CompoBus/S Terminals with 16 points can be set for only even number ad-
dresses.
4. Analog Terminals can be set for only even number addresses.
The communications status between CompoBus/S terminals is output through
AR04 to AR07 Slave Add Flags and Slave Communications Error Flags.
12 11 10 9
OUT OUT OUT OUT
4 3 2 1
IN4 IN3 IN2 IN1
OUT OUT OUT OUT
12 11 10 9
IN12 IN11 IN10 IN9
Note 1. IN0 to IN15 are the input terminals and OUT0 to OUT15 are the output termi-
nals.
2. When the maximum number of CompoBus/S units is set to 16, IN8 to IN15
and OUT8 to OUT15 cannot be used.
3. The Slave Add Flag turns ON when a slave joins the communications. When
the power to the CPU Unit is turned OFF and ON again all bits will turn OFF.
4. The Slave Communications Error Flag turns ON when a slave participating
in the network is separated from the network. The bit will turn OFF when the
slave re-enters the network.
5. For the SRM1, an error will not occur even if the same node address is allo-
cated to more than one slave. Errors will also not occur when communica-
tions go down or communications errors, such as broken lines, occur. Set all
node addresses very carefully and confirm slave operation by including a
section of ladder program using the Status Flags. An example is shown be-
low.
Example
Disconnection (2)
IR 000
Bits 00 to 07
Slave 1
Node 0 (IN0)
Lower Bits: Slave Add Flags
8 7 6 5
OUT OUT OUT OUT
0 7 6 5
IN0 IN7 IN6 IN5
OUT OUT OUT OUT
8 15 14 13
IN8 IN15 IN14 IN13
IR 001
Bits 00 to 07
Slave 2
Node 2 (IN2)
Section
4 3 2 1
OUT OUT OUT OUT
4 3 2 1
IN4 IN3 IN2 IN1
OUT OUT OUT OUT
12 11 10 9
IN12 IN11 IN10 IN9
IR 000
Bits 00 to 07
Node address
duplication (1)
Slave 3
Node 0 (IN0)
2-12
0
OUT
0
IN0
OUT
8
IN8
149